A corpora



W. S. FARNSWORTH.

LOCK GUARD.

APPLICATION FILED APR. 15. 1913.

1,308,734. Patented July 1, 1919.

WITNESSES:

INVENTOR Wilizls'fifriaswori/z,

BYKJKZZZ I UNITED STATES PATENT OFFICE.

WILLIS SMITH FARNSWORTH, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO COIN CONTROLLED LOCK COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORA- 'I'ION OF CALIFORNIA.

LOCK-GUARD.

Specification of Letters Patent.

Patented July 1, 1919.

Application filed April 15, 1913. Serial No. 761,165.

T 0 all whom it may concern:

Be it known that I, WILLIS S. FARNS- WORTH, a citizen of the United States, re-

siding in the city and county of San F rancisco and State of California, have invented new and useful Improvements in Look- G uards, of which the following is a specifioperated without the key being first partially removed from the lock and re-inserted therein.

It is the object of this invention to provide a device of the above character, which is especially applicable for use in connection with coin-controlled locks of that type in whicha cylinder lock is employed, and having coin-controlled means for preventing the operation of the lock and withdrawal of the key therefrom only on depositing of a certain coin, and which is adapted to reengage the cylinder and prevent the re-operation of the look when the key is turned to unlock the look.

It has been-found that persons operating locks of the above type inadvertently turn the key back-ward before removing it from the look, after having deposited a coin and thrown the bolt, thereby accidentally unlocking the lock, thus losing the coin. It is the .purpose of this invention to provide a means for preventing this accidental operation of the lock, which is so constructed v as to necessitate the partial removal of the key from the lock and its re-inserti-on therein before the lock can be unlocked. A further object is to provide a device of the above character which is simple in construction and operation and not liable to get out of order, and which may be easily attached to the lock with but slight alteration of the lock structure. Further objects will appear hereinatter. y

The invention comprises a spring-operated means for normally engaging the cylinder of a l ck, adapted to be released on the insertion of the key in the lock to .permit the rotation of the cylinder in one direction, and which will operate on the reverse movement of the cylinder to rengage the cylinder and thereby prevent its re-operation until after the key has been withdrawn from the lock and re-inserted therein.

The invention further consists of the parts and the construction and combination of parts as hereinafter more fully described I and claimed, having reference to the accompanying drawings, in which- Figure l is a rear view of a coin-operated lock with the bolt in its retracted position, showing the invention as applied.

Fig. 2 is a side elevation of the same.

Fig. 3 is a rear view showing the bolt in its advanced or locked position.

Fig. 4 is a detail in elevation of the lock guard attachment in its released position, prilgr to the turning of the key to lock the Fig. 5 is a detail side view corresponding to Fig. 4.

Fig. 6 is a detail in elevation showing the lock guard in its engaged position, prior to the withdrawal of the key from the lock.

Fig. 7 is a detail side view corresponding to Fig. 6.

Fig, 8 is a detail in elevation of the lock guard as positioned after the key has been removed from the lock.

Fig. 9 is a detail in elevation of the lock guard in the position assumed when the key is re-inserted in the lock.

Fig. 10 is a partial vertical section and side elevation corresponding to Fig. 9.

In the drawings the lock is shown as consisting of an escu'tcheon plate A, a cylinder casing B mounted on the rear side thereof, a cylinder C revolubly mounted in the casing B and having a keyhole D therein adapted to receive a key E by which the cylinder C may be rotated, a series of tumblers F and G mounted in the casing B and cylinder C, a bit H on the cylinder C, and a lock-bolt I engaged by the bit H and reciprocally mounted at the rear side of the escutcheon plate A.

. The lock'consisting of the casing B, cylinder C, and tumblers F and G, is of the wellknown cylinder type, in which the tumblers F and G are adapted to be operated by the key E to position their abutting ends in alinement with the circumferential wall of the cylinder C, to permit the turning of the latter in the casing B and the consequent operation of the belt I in either direction, as is wellknown inlocks of'this character. In locks of this type,' when the cylinder is turned to dispose the tumblers F and G out of alinement with each other, the key E will be securelyheld in the lock against being withdrawna This fact has been taken advantage of inapplying the coin-operated mechanism,

- plate A, on opposite sides of the cylinder C,

are downwardly depending arms 2 and 3, the upper ends of'which are pivotally connected to a face plate 4 on the outer face of the plate A, by means of screws 5 which pass through curved slots 6 in the plate A. The slots 6 act in conjunction with the screws 5 to limit the rocking movement of the face plate 4 and the lock cylinder G in either direction; the plate 4 being connected-to. the cylinder 0. The arms 2.and 3 extend downwardly adjacent to the rear side of the escutcheon plate A; the arm 3 being guided at its lower end by an outwardly extending pin 7, which extends through a. vertical slot 8, in a plate 9,

"formed on the lower end of the arm 3; the

pm 7 being rigid with the escutcheon plate A.

The inner edge of the lower end of the arm 2 contacts the pin 7 and is held thereagainst by means of a helical spring 10, attached at one end to the arm; 2 and at the other end to the arm 3, and is always under tension. The

. pin 7 thus serves to limit the inward movement of the arm 2 and also limits its downward movement when actuated by the plate 4, by reason of its engagement with a shoulder 11 formed on the arm 2. It will be observed that the arm 2 may be rocked outwardly away from the pin 7 ,.in opposition to the spring 10. j

Carried on the lower end of the arm 2 is an inwardly extending plate 12, which proects over the lower end of the arm 3 and forms a coin-socket between the lowerends of the arms 2 and 3, in which a coin may be inserted through a slot 13 for-med in the escutcheon plate A. A coin deposited in the slot 13 is designed to come to rest on a shoulder or abutment 14, formed on the inner edge of the arm 3, where it is supported y reason of, its opposite edge bearing against the inner edge of the arm: 2; the coin indicated at J resting on the shoulder 14 below an inwardly extending flange or coinpusher 15, onthe upper edge of the plate 12 and operated by the arm 2. p i

When the key E is in the lock and the bolt I is in its retracted position, the lower vented by means of the pin 7 and shoulder I 11, so as to preventthe plate 4 and the lock cylinder C being rocked by the key E sufliciently far to allow the latter to be disposed in its vertical position. By this construction the key is prevented from being withdrawn from the lock and also locked against movement, thereby preventing the operation of the bolt 1.

When it is desired to throw the bolt I and withdraw the key E, a coin J of a certain diameter or denomination is deposited in the slot 13 where it comes to rest upon the abutment 14 between the lower ends of the. arms 2 and 3, as before described, and as shown in 1; the shoulder 11 being po-- sitioned a short/distance above the pin 7 to permit of a limited downward movement of the arm 2 and consequent slight rotation of the plate 4 and cylinder C. This movement of the plate 4 is effected by turning the key E after the-coin J is deposited, in such manner as to move the arm 2 in a downward di rection and the arm; 3 in an upward direction. The upward movement of the arm 3 carries the coin J therewith, so as to bring its upper edge into contact with the lower edge of the flange 15 on the plate 12. The downward movement of the arm 2 causes the flange 15 to engage the coin J and move it downwardly in opposition to the arm 3, causing it to press against the shoulder 14 and force the arm 2 away fiom the arm 3, so as to cause the shoulder 11 to clear the pin 7.

This will permit of a continued rotary -m.ove'

ment of the key E, the plate 4, and cylinder C, so as to throw the bolt 1' into the locked position and dispose the key E in the vertical position, which will allow of its being withdrawn from the lock. In thus advanc- 'ing the bolt 1, the arm 3, moves up and the arm 2 down. The coin on passing over the abutment 14 falls upon a stop-shoulder 16 onthe inner edge of the lower end of the arm 3, where it comes to rest with its opposite edge against the pin 7, as shown in,

Theessence of the present invention resides in providing means for automatically locking the cylinder C against rotation when the parts are in the position just described,

which means is adapted necessitate re--- moval of the key from the lock and its reinsertion therein in order to retract the bolt I. This means is here shown as consisting of a plate spring 17 mounted upon the up:

per side of the casing B and extending downwardly opposite the rear end of the cylinder C the lower end of the plate spring 17 having laterally extending portions 18 and 19, formed with inturned flanges 20 and 21 on their ends, extending on oppositasides of the outer end of the casing B. The flanges 20 and 21 on the members 18 and 19 are pr0- vided for the purpose of limiting the sidew-ise movement of the spring 17, as will be later described.

Formed on the lower edge of the member 19 is an inturned flange 22, which is so disosed as to extend into a channel 23 formed 1n the end of the cylinder C, when the cylinder C is positioned as shown in Figs. 3 and 6; that is to say, when'the cylinder C is so disposed as to position the channel 23 horizontally, and the keyhole D vertically. A downwardly extending portion or finger 24 is formed on the spring 17, which extends alongside of the keyhole D, as shown in Figs. 1 and 4, and is adapted to be engaged by the end of the key when the latter is inserted in the lock, to move the spring 17 outwardly and to be engaged by the key when the latter is turned to its withdrawing position, to move the spring 17 laterally.

The operation of the lock guard is as follows; Assuming the parts to be in the position shown in Figs.- 1-4 and 5, in which position the key E is in the keyhole D and the cylinder C is turned to dispose the key E in an angular position and retain the lock-bolt I in its retracted position. The plate spring 17 will then be disposed in its vertical position, with the flange 22 resting on the end of the cylinder (1 and the finger 24 projecting to one side of the end of the key E, which extends a short distance through the rear end of the cylinder C. On the depositing of the coin in the lock and the rotation of the cylinder 0 by the key, as before described, the outer end of the key will engage the finger 24, so as to rock the spring 17 from the position shown in Fig. 4 into the position shown in Figs. 6 and 7, whereupon the 'flange 22 will move into engagement with the channel 23 on the end of the cylinder C,

and thereby lock the latter against rotation.

;The parts will then be positioned as shown a in Figs. 6 and-7. The key E may now be -tion, as shown in Fig. 8, in which position" withdrawn from the lock, and when this occurs the spring 17 will be restored by its own resllieney to its normal vertical posiate the lock, the outer end of the key contacts the inner faceof the finger 24, and operates to move the lower end of the spring 17 out wardly and thereby disengages the flange 22 fromthe channel 23, as shown in Figs. 9 and 10. The cylinder 0 may then be freely turned to retract the bolt I and unlock the lock; the end of the key moving to one side of the finger 24, into the position shown in Fig.7 4, on this operation, so 'as to repositer is turned in one position to lock the cylinder against rotation, said detent means constructed-and arranged to be actuated by the insertion of the key into the lock to release the cylinder, and said detent means operable to engage the cylinder when the key is in the lock and prevent the re-operation of the lock until the key has been withdrawn and reinserted into the lock, said last-named means including a lockable spring plate extendible directly into the path of the end of the key.

2. The combination with a key, cylinder and tumblers of a lock, of means cooperating with the cylinder and directly with the end of the key to permit the rotation of the cylinder only on the initial insertion'of a key therein, and which will operate to lock the cylinder against rotation after the lock has been operated before removal of the key therefrom.

3. In a lock, the combination of a key operated bolt, means for preventing with drawal of the key when the bolt is in unlocked position, and means disposed for actuation by direct engagement with the end of the key for preventing movement of the bolt from locked to unlocked position untll the key has been withdrawn and reinserted in the lock.

4. In a lock, the combination'of a key operated bolt, and means rendered operatlve upon movement of the bolt into locked position and prior to the withdrawal of the key from the lock to prevent unlocking movement of said bolt, said means being adapted to be released directly by the end of the key uppin complete insertion thereof into the loc 5. In a lock, the combination of a key operated locking bolt, a key, a key-receivlng cylinder, connections between the cylinder and said bolt to move said bolt to locking position, means automatically operative to lock the cylinder against rotation when the locking bolt has been moved to locked position thereby preventing rotation of the cylinder until and after the key has been withlatch overlying one end of the key hole adapted to automatically engage in a notch in the cylinder when the bolt is in locked position to prevent rotation of the cylinder, said latch being adapted to be released by direct engagement of the end of the key with said overlying portion upon reinsertion of the key into the cylinder.

7. In a lock, the combination of a key operated locking bolt, a key cylinder, connections between the'bolt and cylinder, and a i spring-pressed latch adapted to engage a notch in the cylinder to lock said cylinder when the' bolt is moved to locked position,

said latch being-constructed to ermit withdrawal of the key from the cylinder but to be directly engaged bythe end of the key upon reinsertion thereof, whereby the latch is released to permit the unlockingof the bolt. n Y i 8. In a lock, the combination of a key r'operated locking bolt, a key 0 linder, and -a latch adapted to automatical y engage with the cylinder upon movement of the cylinder and bolt to locking position and before withdrawal oi the key from the cylinder, whereby to prevent unlocking'of the lock, said latch being adapted to be released by the end of the key only upon reinsertion of the key into the cylinder to thereupon permit the lock to-be unlocked.

9. In a look, the combination of a key operated locking bolt, a cylinder having a key receiving hole therethrough, operative connections between the bolt and cylinder, and a latch overlylng one end of the key hole adapted to automatically engage in a notch in the cylinder when the bolt is in locked position to prevent rotation of the cylinder, said latch being adapted to be released'by direct engagement with the end of the key upon reinsertion of the key into the cylinder.

10. In a lock, the combination of a'key operated locking bolt, a cylinder having a key receiving hole therein, 0 erative connections between-the bolt and vcyllnder, and a resilient latch overlying one end of the key hole adapted to automatically engage in a notch in the cylinder when the bolt is in locked position to prevent rotation of the cylinder,

said latch being adapted to be released from.

' operated lockin reinserted thereinto to engage the same.

means the notch by direct engagement of the end of the key with said overlying portion upon reinsertion of the key into the cylinder.

11. In a lock, the combination of a key bolt, a cylinder having a key receiving ho e therein, means preventing 'withdrawal of the key from the cylinder when the bolt is in unlocked position, operative connections between the bolt and cyllnder, a resilient latch overlying one end of the key hole when the bolt is in unlocked position and adapted tobe forcedto one side of the key hole when the bolt is in locked position, means engaged by saidfilatch for preventing movement of the bolt from locked to unlocked position until the key has been withdrawn from the lock to ermit the latch to assume its position over t e key hole, and

overlying ortion upon insertion of the key 4 into the cy inder.

' 13. A lock comprisng a key operated bolt, means for operating said bolt, and resilient means adapted to be deflected lo'oth longitudinall and laterally of said operating or engaging said operating means and preventing movement thereof to operatesaid bolt from locked to unlocked position until the key has/been withdrawn and I reinserted into the lock.

In testimony whereof I have hereunto set 95 I my hand in the presence of two subscribing I witnesses.- 1

WILLIS SMITH FAaNsWonTH.

Witnesses l i S. B. *C OHRANE,

MARGARET Moon, 

